Slack: validate runtime blocks in send and edit paths

src/slack/actions.blocks.test.ts

@@ -0,0 +1,78 @@
+import type { WebClient } from "@slack/web-api";
+import { describe, expect, it, vi } from "vitest";
+
+vi.mock("../config/config.js", () => ({
+  loadConfig: () => ({}),
+}));
+
+vi.mock("./accounts.js", () => ({
+  resolveSlackAccount: () => ({
+    accountId: "default",
+    botToken: "xoxb-test",
+    botTokenSource: "config",
+    config: {},
+  }),
+}));
+
+const { editSlackMessage } = await import("./actions.js");
+
+function createClient() {
+  return {
+    chat: {
+      update: vi.fn(async () => ({ ok: true })),
+    },
+  } as unknown as WebClient & {
+    chat: {
+      update: ReturnType<typeof vi.fn>;
+    };
+  };
+}
+
+describe("editSlackMessage blocks", () => {
+  it("updates with valid blocks", async () => {
+    const client = createClient();
+
+    await editSlackMessage("C123", "171234.567", "", {
+      token: "xoxb-test",
+      client,
+      blocks: [{ type: "divider" }],
+    });
+
+    expect(client.chat.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        channel: "C123",
+        ts: "171234.567",
+        text: " ",
+        blocks: [{ type: "divider" }],
+      }),
+    );
+  });
+
+  it("rejects empty blocks arrays", async () => {
+    const client = createClient();
+
+    await expect(
+      editSlackMessage("C123", "171234.567", "updated", {
+        token: "xoxb-test",
+        client,
+        blocks: [],
+      }),
+    ).rejects.toThrow(/must contain at least one block/i);
+
+    expect(client.chat.update).not.toHaveBeenCalled();
+  });
+
+  it("rejects blocks missing a type", async () => {
+    const client = createClient();
+
+    await expect(
+      editSlackMessage("C123", "171234.567", "updated", {
+        token: "xoxb-test",
+        client,
+        blocks: [{} as { type: string }],
+      }),
+    ).rejects.toThrow(/non-empty string type/i);
+
+    expect(client.chat.update).not.toHaveBeenCalled();
+  });
+});